Florida largemouth bass, Micropterus salrnoides floridanus (Le Sueur), northern largemouth bass, M.s. salrnoides (Lacepede), and their F1 hybrid were stocked in a 3. 64-hectare pond, and their growth rates and catchability compared. The hybrid and Florida bass were found to achieve the best growth over a 3-yr period, apparently due to genetic influences rather than environmental factors. Differences in catchability were not observed among the three strains oflargemouth bass.